Icom IC-701 User manual

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1

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SOLID

STATE

__

TRANSCEIVER

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SECTION

SECTION

SECTION

SECTION

4-1

4-2

4-3

SECTION

5-1

5-2

5-3

5-4

5-5

SECTION

6-1

6-2

6-3

6-4

6-5

6-6

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SECTION

|

SPECIFICATIONS

GENERAL

Number

of

Semi-Conductors:

Transistors

128

FET

23

IC

(Includes

LS!1)

56

Diodes

265

Frequency

Coverage:

1.8MHz

~

2.0MHz

3.5MHz

~

4.0MHz

7.0MHz

~

7.5MHz

(7.3MHz~7.5MHz

Receive

Only)

14.0MHz~15.2MHz

(14.35MHz~15.2MHz

Receive

Only)

21.0MHz~21.5MHz

28.0MHz~30.0MHz

(28.0MHz~29.7MHz

Transmit

Range)

Frequency

Control:

LSI

based

100Hz

step

Digital

PLL

synthesizer.

Independent

Transmit-Receive

Frequency

Available

on

same

band.

TRANSMITTER

DC

Input

Power:

SSB

(A3J)

200

Watts

CW

(Ai),

RTTY

(Fi)

200

Watts

Continuously

Adjustable

Output

power

0~Max.

Emission

Mode:

A3J

SSB

(Upper

sideband

and

Lower

sideband)

Al

CW

Fi

RTTY

(Frequency

Shift

Keying)

Harmonic

Output:

More

than

40dB

below

peak

power

output

Spurious

Output:

More

than

60dB

below

peak

power

output

Carrier

Suppression:

More

than

40dB

below

peak

power

output

Unwanted

Sideband:

More

than

40dB

down

at

1000Hz

AF

input

Microphone:

Impedance

600

ohms

Input

Level

10

millivolts

typical

Dynamic

or

Electret

Condenser

Microphone

Frequency

Readout:

6

digit

LED

100Hz

readout.

Frequency

Stability:

Less

than

500Hz

after

switch

on

1

min

to

60

mins,

and

less

than

100Hz

after

1

hour.

Less

than

1KHz

in

the

range

of—10°C

to

+60

°C.

Power

Supply

Requirements:

DC

13.6V

+15%

Negative

ground

Current

drain

18

A

max.

(at

200W

input)

AC

power

supply

speaker

console

is

available

for

AC

operation.

Antenna

!mpedance:

50

ohms

Unbalanced

Weight:

7.3Kg

Dimensions:

111mm

x

241mm

x

311mm

(H

x

W

x

L)

RECEIVER

Receiving

System:

Triple

Conversion

Superheterodyne

with

continuous

Bandwidth

Control

Receiving

Mode:

Ai,

A3J

(USB,

LSB)

Fi

(Output

FSK

audio

signal)

IF

Frequencies:

Ist

9.0115MHz

2nd

10.75MHz

3rd

9.0115MHz

with

continuous

Bandwidth

Control

Sensitivity:

Less

than

0.25

microvolts

for

10dB

S+N/N

Selectivity:

SSB.

RTTY

+1.2KHz

at

—6dB

(Adjustable

to

+0.5KHz

Min)

+2.0KHz

at

—60dB

CW

+250Hz

at

—6dB

+700Hz

at

—60dB

CW-N

+100Hz

at

—6dB

+500Hz

at

—60dB

(with

Audio

Filter)

Spurious

Response

Rejection

Ratio:

More

than

60dB

Audio

Output:

More

than

1.5

Watts

Audio

Output

Impedance:

8

ohms

oe

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SECTION

2

FEATURES

ALL.

BAND,

ALL

MODE,

ALL

SOLID

STATE

The

IC-701

covers

all

the

Amateur

HF

frequencies

from

1.8MHz

to

29.999.9MHz

plus

15MHz

WWV.

It

offers

not

only

SSB,

but

also

CW

and

RTTY.

All

of

the

circuits

in

the

IC-701,

including

the

driver

and

final

power

stages

are

completely

solid

state,

and

provide

about

100

Watts

output.

COMPUTER

COMPATIBLE

TUNING

SYSTEM

The

local

oscillator

circuit

(VFO)

employs

a

C-MOS

LSI!

for

the

PLL

that

has

been

custom-made

on

the

basis

of

ICOM’s

advanced

digital

technology.

The

VFO

circuit

is

a

digital

PLL

circuit

that

controls

frequency

determination

by

pulses

produced

by

the

tuning

control.

Unlike

conventional

PLLs,

it

controls

the

VCO

by

combining

and

dividing

crystal

oscillator

frequencies.

Therefore,

its

stability

is

much

higher

than

conventional

VFOs.

In

addition,

the

pulse

control

system

makes

it

possible

to

set

and

change

frequencies

with

external

digital

signals.

With

a

computer

programmed

and

connected

to

the

rear

accessory

socket,

you

can

easily

control

frequencies,

change

bands,

scan,

on

the

IC-701.

This

system

will

give

you

the

maximum

of

performance

and

versatility.

DUAL

DIGITAL

VFO’S

The

IC-701

contains

two

built-in

digital

VFO’s

located

in

ICOM’s

custom

LSI,

providing

the

ultimate

in

versitility.

DIGITAL

READOUT

AND

FULL

METERING

The

frequency

is

presented

in

bright

easy

to

read

LEDs,

with

no

backlash

or

waiting

time.

The

mulit-function

meter

shows

you

relative

signal

strength

in

receive,

power

output,

ALC,

SWR,

compression

level,

final

transistor

voltage

and

current.

All

the

important

information

you

need

to

know.

PASS

BAND

TUNING AND

SPEECH

PROCESSOR

The

IC-701

has

a

built-in

Pass

Band

Tuning

system

developed

by

ICOM

that

allows

you

to

continuously

adjust

the

pass

band

of

the

IF.

By

turning

the

control,

you

can

eliminate

interference

from

a

nearby

signal,

thus

providing

clear

reception.

It

can

also

be

used

as

a

tone

control.

During

transmit,

the

Pass

Band

Tuning

circuit

can

be

used

as

a

Speech

Processor

providing

increased

“talk

power”

for

outstanding

D

Xing.

OUTSTANDING

PERFORMANCE

The

RF

amplifier

circuit

using

MOS

FETs,

the

Schottky

barrier

diode

balanced

mixer

and

other

circuits

provide

excellent

Cross

Modulation

and

Two-Signal

Selectivity

characteristics.

The

IC-701

has

excellent

sensitivity

demanded

especially

for

mobile

operation,

high

stability,

and

with

two

Crystal

Filters

having

high

shape

factors,

exceptional

selectivity.

The

Same

Schottky

diode

mixer

is

used

in

the

transmitter,

and,

with

the

band

pass

filter

and

high

performance

K-Constant

two

stage

low-pass

filter,

ensures

transmission

of

pure

signals

with

very

low

spurious

emission.

ADDITIONAL

CIRCUITS

The

IC-701

has

a

built-in

Noise

Blanker,

VOX,

an

Auto

Dimmer

for

control

of

the

readout

and

meter

illumination,

CW

Monitor,

APC,

SWR

detector,

and

many

other

circuits

for

your

convenience.

The

IC-701

has

everything

you

need

to

really

enjoy

HF

operation,

in

an

extremely

compact,

rugged

transceiver.

enim

ase

aetna

thecbaet

ts

talc

etna

easement

einen

es

mate

we

sonnet,

SECTION

3

INSTALLATION

BE

SURE

TO

READ

THE

FOLLOWING

INSTRUCTIONS

BEFORE

USE.

3-1

UNPACKING

Carefully

remove

your

transceiver

from

the

packing

carton

and

examine

it

for

signs

of

shipping

damage.

Should

any

be

apparent,

notify

the

delivering

carrier

or

dealer

im-

mediately,

stating

the

full

extent

of

the

damage.

It

is

recommended

you

keep

the

shipping

cartons.

In

the

event

storage,

moving,

or

reshipment

becomes

necessary

they

will

be

handy.

Accessory

cables,

plugs,

etc.,

are

packed

with

the

transceiver.

Make

sure

you

have

not

overlooked

anything.

1.

Microphone

(1C-SM2)

..........

0.0.

e

eee eee eee

1

2.

External

Speaker

Plug...

..

2.0.0...

cc

ee

eee

wees

1

Oe

SCV

FIUG*

oo

tack

ne

ieee

an

tee

seek

e

te

ee

oe

tee

1

4.

Scope

Terminal

Plug...........

0.0.02

eee

eens

1

5.

Transverter

terminal

Plug

.............005

0

eee

1

6.

Spare

Fuse

(20

Amp)

...........

000

ee

eee

eeee

2

7;

DG,

Power

Cord’.

oe

adie

Set

ied

yee

ee

es

1

8.

Accessory

Plug

(24

Pin)

............02

0c

eee

1

GO:

Accessory

Plug

PINs

-

3-4

ewiiwat-

ie

oa

ek

Sat

es

24

10.

Accessory

Plug

Boot

............

0c

cece

eee

eens

1

3-2

RECOMMENDATIONS

FOR

INSTALLATION

1.

Avoid

placing

the

IC-701

in

direct

sunlight,

high

temperature,

dusty

or

humid

places.

2.

The

left

side

of

the

unit,

when

facing

it,

functions

also

as

a

heatsink.

The

temperature

there

will

usually

become

relatively

warm

during

transmission.

Any

equipment

should

be

at

least

1

inch

(83cm)

away

from

the

unit

so

as

to

provide

good

ventilation.

Be

sure

that

nothing

is

on

and

just

behind

the

rear

PA

heatsink

to

ensure

good

ventilation.

Also

avoid

places

near

outlets

of

heaters,

air

conditioners

etc.

3.

Place

the

unit

so

that

the

controls

and

switches

can

easily

be

handled

and

the

frequency

indication

and

meter

can

easily

be

read.

4.

For

mobile

installation,

an

optional

mounting

bracket

is

available.

Select

the

best

location

that

can

stand

the

weight

of

the

unit

and

that

does

not

interfere

with

your

driving

in

any

way.

5.

Use

the

Ground

Lug!

3-3

POWER

SUPPLY

For

AC

operation,

use

the

special

power

supply

!C-701PS.

If

you

would

like

to

use

your

car

battery

or

any

other

DC

power

supply,

be

sure

that

its

output

voltage

is

12-15

Volts

and

the

current

capacity

is

at

least

20

Amps.

The

maximum

power

consumption

of

the

set

during

transmission

runs

from

16-20

Amps,

so

keep

that

in

mind

if

the

unit

is

installed

in

your

automobile,

and

turn

it

on

after

you

have

started

the

engine.

Attention

should

also

be

paid

to

the

condition

of

the

battery

and

electrical

system.

The

connection

of

the

DC

power

cord

supplied

with

the

1C-701

is

done

in

the

following

way:

First

make

sure

that

the

power

switch

of

the

unit

is

in

the

OFF

position

and

the

T/R

switch

is

in

the

receive

position.

Connect

the

cord

to

the

DC

power

supply

with

the

RED

lead

to

the

positive

terminal

and

the

BLACK

lead

to

the

negative

terminal.

(Reverse

connection

will

cause

the

protection

circuit

to

operate

and

blow

the

fuse.)

Connect

the

DC

plug

to

the

socket

on

the

rear

panel

of

the

!C-701.

Refer

to

the

drawing

below.

a

seas

O

A

|

1C-701PS

:

pSeRR

ER

RESEREREESES

AC

POWER

OUTLET

For

AC

operation

BATTERY

or

De

POWER

SOURCE

DC

POWER

CORD

For

DC

operation

3-4

ANTENNA

Antennas

play

a

very

important

role

in

radio

communi-

cation.

If

the

antenna

is

inferior,

your

transceiver

cannot

give

you

the

best

performance.

With

a

good

antenna

and

feeder

cable

having

50

ohm

impedance,

you

should

easily

get

the

desired

matching

and

performance.

Carefully

install

a

high

performance

antenna

that

suits

the

frequency

band(s)

you

wish

to

operate

on

and

place

it

as

high

as

possible.

Be

especially

careful

of

the

condition

of

the

connectors

as

loose

connections

will

deteriorate

the

per-

formance.

Be

sure

to

connect

the

ground

terminal

of

a

whip

antenna,

if

used,

to

the

body

of

your

car.

As

the

output

is

quite

high,

avoid

connecting

the

antenna

connector

to

open

lines

and

do

not

transmit

under

mismatched

conditions.

Otherwise

the

final

stage

could

be

overloaded

and

cause

a

malfunction

of

the

unit.

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3-5

GROUND

In

order

to

prevent

electrical

shocks,

TVI,

BC!

and

other

problems,

be

sure

to

connect

a

heavy

wire

ground,

as

short

as

possible,

from

a

good

earth

point

to

the

ground

terminal

on

the

rear

panel.

3-6

MICROPHONE

The

microphone

supplied

with

the

IC-701

is

the

IC-SM2

which

contains

a

pre-amplifier.

It’s

circuit

diagram

is

shown

below.

The

IC-SM2

is

an

Electret

Condenser

type

microphone.

Schematic

diagram

of

IC-SM2

R7

200M

(2)

°

3

3

7]

°

o

°

TR1,

TR2:

2SC536

or

equivalent

A

sensitivity

contro!

is

installed

on

the

bottom

side

of

the

mic

stand.

By

turning

it

in

the

“’H”

or

“L”

direction,

the

sensitivity

will

increase

or

decrease

respectively.

Adjust

the

control

so

as

to

get

the

proper

sensitivity

considering

the

distance

to

the

mic,

the

loudness

of

your

voice

and

the

environmental

conditions.

The

wind

screen

not

only

prevents

background

noise

due

to

wind,

but

also

protects

the

mic.

Unless

required,

do

not

remove

the

screen

from

the

mic.

In

order

to

operate

the

microphone,

connect

its

plug

to

the

mic

socket

on

the

IC-701.

To

transmit,

press

the

PTT

switch

downward.

When

it

is

released,

the

IC-701

will

return

to

the

receive

condition.

For

a

long

transmis-

sion,

pull

the

PTT

switch

back

while

pressing

it

down

until

the

switch

is

locked

and

it

will

remain

in

that

position

until

it is

pushed

forward

and

released.

LOCK

RELEASE

Key

Wiring

Diagram

If

you

would

like

to

use

a

different

microphone

in

your

car,

an

optional

hand

held

dynamic

microphone

is

available.

If

other

types

of

microphones

are

used,

be

sure

their

impedance

is

between

500-600

ohms,

and

connect

a

4

pin

plug

in

the

manner

shown.

Microphone

plug

exploded

view

Microphone

connection

Microphone

(cord

side

view)

3-7

CW

KEY

When

operating

CW,

connect

the

Key

to

the

Key

Jack

with

the

plug

supplied.

The

connection

of

the

plug

is

shown

below.

If

the

terminals

have

polarity,

be

sure

to

make

the

correct

connection.

Note

that

the

keyed

voltage

when

switching

with

semiconductors

or

relays

with

resistors

in

the

circuit,

should

be

adjusted

to

be

below

0.4

Volts!

3-8

RTTY

When

operating

RTTY,

connect

the

ACC

socket

pins

8

(ground)

and

9

to

your

tele-typewriter

through

a

high

speed

relay

or

a

level

converter

to

TTL

level,

and

the

tones

for

your

terminal

unit

will

be

available

from

pin

4.

For

details,

refer

to

“How

to

use

RTTY”,

and

“Transmit

and

Receive”’

sections

in

this

manual.

3-9

EXTERNAL

SPEAKER

The

IC-701

contains

an

internal

speaker,

and

is

also

designed

so

that

it

can

drive

an

external

speaker

from

the

external

(EXT)

speaker

jack

on

the

rear

panel.

Be

sure

the

impedance

of

the

external

speaker

is

8

ohms,

and

remember

that

with

the

external

speaker

connected,

the

internal

speaker

is

disabled.

3-10

HEADPHONES

Any

good

headphone

set,

including

stereo

type,

that

have

4-16

ohms

impedance

can

be

used.

With

the

plug

inserted

halfway

into

the

PHONES

jack,

both

the

headphone

and

speaker

will

operate. This

is

convenient

when

others

wish

to

listen

in

on

the

station,

or

you

wish

to

record

contacts

using

a

tape

recorder

connected

to

the

headphone

jack.

With

a

stereo

headphone

set

inserted

this

way,

however,

the

headphone

will

lose

the

sound

on

one

side.

With

the

plug

inserted

completely,

only

the

headphone

works.

3-11

POWER

SUPPLY

It is

highly

recommended

that

you

use

the

[C-701PS

power

supply

for

base

operation.

If

you

wish

to

use

another

power

source,

make

sure

that

it

meets

the

voltage,

current,

and

regulation

requirements.

Pay

particular

attention

to

the

overvoltage

protection

as

a

runaway

regulator

can

destroy

the

IC-701.

Make

certain

that

more

than

18

Volts

does

not

get

applied

to

the

unit.

When

the

power

switch

is

in

the

ON

position,

do

not

connect

the

power

cord,

antenna,

external

speaker,

Accessory

plug,

or

the

mi-

crophone

to

avoid

possible

trouble.

Be

sure

not

to

transmit

with

the

antenna

disconnected.

If

the

fuse

blows,

replace

it

with

a

new

20

Amp

fuse

after

fixing

the

cause.

Avoid

turning

the

power

switch

ON

and

OFF

repeatedly

over

a

short time.

Frequent

repetitions

may

cause

the

frequency

indicator

to

display

the

wrong

frequencies.

If

such

a

malfunction

should

occur,

turn

OFF

the

switch

and

a

few

seconds

later

turn

it

ON

again.

3-12

CAUTIONS

As

the

unit

has

already

been

closely

adjusted

with

highly

sophisticated

measuring

instruments,

never

tamper

with

the

turnable

resistors,

coils,

trimmers,

etc.

IN

THE

PLL

UNIT,

THE

HEART

OF

THE

TRAN-

SCEIVER,

A

C-MOS

LSI

IS

INCORPORATED.

IF

THE

SEAL

IS

BROKEN

WHEN

A

FAILURE

OCCURS

WITHIN

THE

TERMS

OF

THE

GUARANTEE,

THE

REPAIR

MAY

BE

AT

THE

USERS

EXPENSE,

SO

DO

NOT

ATTEMPT

TO

OPEN

THE

PLL

CASE!

C-MOS

is

also

used

in

the

digital

driver

unit

as

well

as

the

PLL.

C-MOS

ICs

are

very

susceptible

to

excessive

static

charges

and

over

current

and

care

must

be

used

when

handling

them.

Therefore,

avoid

touching

the

driver

unit

and

the

nearby

circuitry

unless

absolutely

necessary.

When

it

is

necessary

to

check

the

circuitry,

observe

the

following

points.

Ground

all

measuring

instruments,

the

soldering

iron,

and

other

tools.

Do

not

connect

or

disconnect

the

C-MOS

IC

from

its

socket,

or

solder

it

when

the

power

is

ON.

Do

not

apply

voltage

of

less

than

—0.5

or

more

than

+5

Volts

to

the

input

terminals

of

the

IC.

DO

NOT

MEASURE

WITH

AN

OHMMETER.

3-13

COOLING

FAN

The

rear

of

the

PA

unit

is

designed

to

achieve

effective

natural

cooling.

But

with

200

Watts

input,

the

final

stage

circuit

produces

quite

a

bit

of

heat

and

its

temperature

may

rise

during

a

very

long,

continuous

transmission.

If

the

temperature

becomes

high

enough,

the

built-in

cooling

fan

will

start

to

spin.

The

fan

is

connected

to

the

temperature

monitoring

circuit

which

detects

the

temperature

of

the

final

stage

transistors.

The

operation

of

this

fan

is

as

follows:

1.

The

fan

does

not

work

during

all

reception.

2.

During

transmission,

it

does

not

work

if

the

detected

temperature

is

below

a

certain

level.

3.

When

the

temperature

exceeds

that

level

during

a

transmission,

the

fan

will

start

to

move

air

across

the

heatsink

to

cool

it.

4.

If

the

temperature

of

the

final

stage

transistors

rises

to

the

danger

point,

the

fan

will

turn

at

a

much

higher

speed

and

frequency

display

will

start

to

flash.

THIS

MEANS

STOP

TRANSMITTING!

1,

2

and

3

are

normal

conditions.

4

is

abnormal.

If

the

meter

and

display

start

to

flash,

stop

transmitting

and

check

for

the

cause

of

the

excess

heat.

This

could

be

antenna

mismatch,

environmental

problems,

etc.,

but

be

sure

to

rectify

the

problem

before

beginning

to

operate

again.

—5—

i

er

A

ae

waa

tnt

So

eS

aR

OR

lm

Li

tS

AORN

eR

ON

the

ene

en

BAM

enh

Rr

SECTION

4

OPERATING

CONTROLS

4-1

FRONT

PANEL

@

DIAL

LOCK

INDICATOR

LED

@

FREQUENCY

DISPLAY

@

DIAL

TS

INDICATOR

LED

@

TRANSMIT

INDICATOR

LED

@

MULTI-FUNCTION

METER

78

5

ALC

Po

ef

ee

COMP

4.4

“io

35

Sm!

>

aT

@

BAND

SWITCH

en

mr

(.

@®

METER

SELECT

whe

SWITCH

rd

@

POWER

SWITCH

®

PHONES

JACK—33

®

MIC

CONNECTORS

/

4

WB.

TINE

/’

fj

i

@

COMP

(SPEECH

PROCESSOR)

CONTROL

@®

MIC

GAIN

CONTROL

@

AF

GAIN

CONTROL

@

RF

GAIN

CONTROL

@

MODE

SELECT

SWITCH

(PASS

BAND

TUNING

(

VFO

SWITCH

@

RIT

CONTROL

1.

BAND

SWITCH

The

BAND

SELECT

SWITCH

is

a

7

position

rotary

switch

used

for

selecting

one

of

the

6

Amateur

bands

covered

by

the

IC-701

with

a

7th

position

for

external

control.

The

selectable

bands

are

1.8MHz,

3.5MHz,

7MHz,

14MHz,

21MHz

and

28MHz.

In

the

EXT

position,

the

band

can

be

selected

remotely.

However,

the

switch

should

not

be

put

in

the

EXT

position

without

having

the

remote

control

connected.

This

will

cause

the

rotary

switch

to

rotate

continuously

and

may

cause

excessive

wear

or

damage.

2.

MULTI-FUNCTION

METER

With

the

{C-701

in

the

receive

mode,

this

meter

acts

as

an

S

meter

regardless

of

the

position

of

the

meter

select

—-6-—-

11c-70O8

8

RATB

-

.

Lo

SBR

pit

NB

oRaC

ee,

@

DIAL

LOCK

BUTTON

@

TUNING

CONTROL

KNOB

@

TUNING

SPEED

BUTTON

12

AGC

SWITCH

@

ATTENUATOR

SWITCH

(®

NOISE

BLANKER

SWITCH

(9

VOX

SWITCH

1)

RIT

SWITCH

@

TRANSMIT/RECEIVE

SWITCH

switch.

Signal

strength

is

indicated

on

a

scale

of

$1-S9

and

$9+20dB

to

S9+60dB.

In

the

transmit

mode,

the

meter

has

5

functions

as

outlined

below

which

are

selected

by

the

meter

select

switch.

3.

METER

SELECT

SWITCH

In

the

transmit

mode

the

meter

has

5

functions.

1.

Ve

Indicates

the

collector

voltage

of

the

final

transistors.

2.

Ic

Indicates

the

collector

current

of

the

final

transistors.

3.

Po

Indicates

the

relative

output

power.

SWR

can

eenicnenne

eines

te

cca

area

ah

ete

ast

at

ea

ORthtee

am

iat

ne

nlite

nee

EEE

Ane

aoe

emabaeSiNeS

|

be

measured

by

placing

the

SWR/SWR

SET

switch

in

the

SWR

position.

(This

switch

is

located

under

the

access

cover

on

the

top

of

the

IC-701.

4.

ALC

In

this

position,

the

meter

begins

to

function

when

the

RF

output

power

reaches

a

certain

level.

5.

COMP

Indicates

the

compression

level

when

the

speech

processor

is

in

use.

4.

POWER

SWITCH

The

POWER

SWITCH

is

a

push-lock

type

switch

which

controls

the

input

DC

power

to

the

IC-701.

When

the

external

AC

power

supply

(IC-701PS)

is

used,

the

switch

also

acts

as

the

AC

power

supply

switch.

When

the

switch

is

pushed

in

and

locked,

power

is

supplied

to

the

set.

When

the

switch

is

pushed

again

and

released,

power

is

cut

to

all

circuits

except

the

PA

unit.

5,

PHONE

JACK

This

jack

accepts

a

standard

1/4

inch

headphone

plug

for

a

4-16

ohm

headphone

set.

Stereo

headphones

can

be

used

without

modification.

6.

MIC

CONNECTOR

Connect

the

supplied

microphone

or

optional

microphone

to

this

jack.

If

you

wish

to

use

a

different

microphone

than

the

IC-SM2,

refer

to

the

drawing

on

page

4.

Mic-

rophone

impedance

should

be

500-600

ohms.

7.

COMP

(SPEECH

PROCESSOR)

CONTROL

The

IC-701

contains

a

built-in

RF

speech

processor

which

is

turned

ON

by

turning

the

center

knob

clockwise

from

the

OFF

position

(a

click

will

be

heard).

In

the

ON

position

it

works

as

the

RF

drive

control

as

explained

below.

In

the

CW

and

RTTY

modes,

it

works

as

the

output

level

control

of

the

IC-701.

When

RF

speech

processor

operation

is

not

desired,

the

COMP

control

should

be

turned

completely

counter-clockwise

and

clicked

OFF.

8.

MIC

GAIN

CONTROL

Adjusts

the

level

of

modulation

according

to

the

input

of

the

microphone.

Clockwise

rotation

increases

microphone

gain.

As

the

input

will

vary

with

different

microphones

and

different

voices,

the

knob

should

be

turned

until

the

MULTI-FUNCTION

METER

needle,

in

the

ALC

mode,

starts

to

move

slightly

within

the

ALC

zone.

In

the

SSB

mode,

with

the

RF

speech

processor

in

use,

the

MIC

GAIN

CONTROL

sets

the

clipping

limits,

while

the

COMP

control

sets

the

RF

drive

level

up

to

the

maximum

power

level

where

ALC

begins

at

the

saturation

point

of

the

amplifiers.

9.

AF

GAIN

CONTROL

Controls

the

audio

output

level

in

the

receive

mode.

Clockwise

rotation

increases

audio

output.

10.

RF

GAIN

CONTROL

Controls

the

gain

of

the

RF

section

in

the

receive

mode.

Clockwise

rotation

gives

the

maximum

gain.

As

the

control

is

rotated

counter-clockwise,

the

needle

of

the

MULTI-FUNCTION

METER

rises,

and

only

signals

stronger

than

the

level

indicated

by

the

needle

will

be

heard.

11.

MODE

SELECT

SWITCH

This

switch

selects

the

mode

of

operation

for

both

transmit

and

receive.

USB

Upper

Sideband,

mainly

for

14,

21

and

28MHz

bands.

LSB

Lower

Sideband,

mainly

for

1.8,

3.5

and

7MHz

bands.

CW

Continuous

Wave,

for

CW

operation

on

all

bands.

~CW-N

Narrow

CW.

The

audio

band-pass

filter

is

auto-

matically

turned

ON

in

this

position

to

improve

selectivity

when

receiving.

RTTY

Radio

Teletype.

For

use

on

all

available

bands.

12.

P.

B.

TUNE

(PASS

BAND

TUNING)

CONTROL

This

control

allows

continuous

tuning

of

the

pass

band

selectivity

moving

the

edge

of

the

filter

up

to

1.5KHz

from

either

the

upper

or

lower

side

in

SSB

and

RTTY.

This

not

only

improves

selectivity,

but

also

can

improve

the

audio

quality.

The

normal

position

is

in

the

center

(12:00

o'clock) position

and

is

2.4KHz

wide

in

SSB.

13.

VFO

SWITCH

With

this

switch

you

can

select

the

VFO

you

want

to

operate

from

two

separate

VFO’s

that

are

built-in

to

the

IC-701.

It

also

selects

the

relationship

of

the

two

VFO’s.

The

switch

performs

the

following

operations

according

to

its

position.

*

A:

Selects

““A’’

VFO

for

both

transmit

and

receive.

*

B:

Selects

‘“B’’

VFO

for

both

transmit

and

receive.

*

RA-TB

:

Selects

‘““A’’

VFO

for

receive

and

‘B’’

VFO

for

transmit.

*

RB-TA:

Selects

‘‘B’’

VFO

for

receive

and

“A’’

VFO

for

transmit.

In

addition,

when

the

VFO

is

switched

from

“‘A’’

VFO

to

“B’

VEO,

the

frequency

indicated

on

the

frequency

display

just

prior

to

switching

goes

into

a

memory

inside

the

LSI.

Thus

even

if

‘“B’’

VFO

is

being

used,

switching

to

“A”

again

will

enable

you

to

operate

at

the

initial

frequency.

Switching

from

“‘B”

to

“A”

results

in

the

same

operation.

However,

if

switching

is

done

with

the

BAND

SWITCH

(or

external

control),

the

VFO

frequency

displayed

will

disappear

and

the

lower

end

frequency

of

the

band

selected

will

be

displayed.

If

you

wish

to

operate

on

the

frequency

that

was

memorized

in

the

VFO

that

was

not

used

when

switching

bands,

simply

return

to

the

original

band

and

then

to

the

other

VFO

and

the

initiall

memorized

frequency

will

appear.

more

detail

later

in

this

manual.

This

is

explained

in

14.

RIT

CONTROL

Shifts

the

receiver

frequency

+800Hz

either

side

of

the

transmit

frequency.

When

the

RIT

is

ON,

the

RIT

LED

is

illuminated.

The

LED

also

represents

the

‘‘0’’

position.

Rotating

the

control

to

the

(+)

side

raises

the

receiver

frequency,

and

rotating

to

the

(—)

side

lowers

the

receiver

frequency.

With

the

RIT

ON,

if

the

tuning

knob

@j)

is

moved

one

increment,

the

RIT

circuit

is

automatically

pulsed

OFF.

Therefore

it

is

not

necessary

to

manually

turn

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OFF

the

RIT

when

changing

operating

frequency.

The

frequency

shift

by

tuning

the

RIT

Control

is

not

indicated

on

the

frequency

display.

15.

RIT

SWITCH

This

is

a

spring-loaded

switch

for

the

RIT

control.

To

turn

ON

the

RIT,

push

down

once.

If

OFF

is

desired,

push

down

again.

When

the

RIT

is

ON

the

LED

above

the

RIT

control

knob

is

lit.

This

also

indicates

the

center

position

of

the

RIT

control.

With

the

RIT

circuit

OFF

the

LED

is

also

OFF.

Also

if

the

RIT

is

ON

and

the

Tuning

Knob

is

rotated

one

increment

it

will

pulse

the

RIT

OFF

unless

the

internal

jumper

has

been

changed.

16.

NB

(NOISE

BLANKER)

SWITCH

When

pulse

type

noise

such

as

automobile

ignition

noise

is

present,

set

this

switch

to

the

ON

(down)

position.

The

noise

will

be

reduced

to

provide

comfortable

reception.

17.

AGC

(AUTOMATIC

GAIN

CONTROL)

SWITCH

With

this

switch

you

can

change

the

time

constant

on

the

AGC

circuit.

With

the

switch

in

the

AGC

(up)

position,

the

circuit

operates

as

a

‘“hang’’

AGC

and

maintains

the

AGC

voltage

for

a

specific

time,

thus

it is

suitable

for

SSB

reception.

With

the

switch

in

the

FAST

(down)

position,

the

circuit

is

OFF,

and

AGC

is

suitable

for

stations

suffering

from

fast

fading

or

operating

in

the

CW

mode.

18.

TRANSMIT/RECEIVE

(T/R)

SWITCH

This

switch

is

for

manually

switching

from

transmit

to

receive

and

vice

versa.

Set

the

switch

to

RECEIVE

(up)

and

the

!C-701

is

in

the

receive

mode.

Set

the

switch

to

TRANSMIT

(down)

and

it

switches

to

transmit.

When

switching

with

the

PTT

switch

on

the

microphone

or

with

the

VOX

switch

set

to

ON

the

T/R

switch

must

be

in

the

RECEIVE

position.

19.

VOX

SWITCH

This

switches

the

VOX

circuit

ON

and

OFF.

When

it

is

in

the

ON

(down)

position,

in

SSB,

T/R

switching

is

accomplished

by

means

of

a

voice

signal.

!n

CW

operation,

semi-break-in

switching

by

means

of

keying

is

possible.

20.

ATT

(ATTENUATOR)

SWITCH

Turn

the

ATT

switch

ON

(down)

when

strong

nearby

signals

disturb

signal

reception

or

make

“’S”

readings

difficult.

in

the

ON

position,

a

10dB

attenuator

is

inserted

into

the

receiving

antenna

circuit,

reducing

interfering

signals

and

giving

more

stable

reception.

In

normal

operation

the

ATT

switch

is

left

in

the

OFF

(up)

position.

21.

TUNING

CONTROL

KNOB

Rotating

the

TUNING

CONTROL

KNOB

clockwise

in-

creases

the

frequency,

while

rotating

it

counter-clockwise

decreases

the

frequency.

The

frequency

is

changed

in

100Hz

steps

which

correspond

to

the

smaller

vernier

marks

on

the

knob.

The

larger

marks

represent

1KHz

steps.

One

complete

rotation

of

the

tuning

knob

results

in

a

5KHz

frequency

increase

or

decrease

in

100Hz

steps

exactly

as

shown

by

the

small

vernier

marks.

22.

TUNING

SPEED

BUTTON

Pushing

the

TUNING

SPEED

BUTTON

will

illuminate

the

DIAL

FAST

display

LED,

and

the

small

vernier

marks

on

the

tuning

knob

are

changed

to

correspond

to

10KHz

steps.

At

the

same

time,

the

1KHz

and

100Hz

digits

are

cleared

on

the

display

to

show

‘0.0’...

When

the

Tuning

Speed

Button

is

depressed

again,

the

dial

fast

display

LED

goes

OFF

and

the

small

vernier

marks

will

again

correspond

to

100Hz

steps.

This

button

will

allow

you

to

quickly

QSY

over

a

great

frequency

range.

23.

DIAL

LOCK

BUTTON

After

the

IC-701

is

set

to

a

certain

frequency

for

rag

chewing,

mobile

operation,

etc.,

pushing

the

DIAL

LOCK

BUTTON

will

illuminate

the

DIAL

LOCK

display

LED

and

the

VFO

is

electronically

locked

at

the

displayed

frequency,

thus

inactivating

the

operation

of

the

tuning

knob.

To

change

frequency,

the

dial

lock

must

first

be

disengaged

by

pushing

the

dial

lock

button

again.

The

dial

lock

display

LED

will

go

OFF

and

the

frequency

will

change

with

the

direction

of

the

tuning

knob

rotation.

Turning

the

power

OFF

will

release

the

dial

lock

and

clear

the

displayed

frequency.

24.

FREQUENCY

DISPLAY

The

frequency

of

the

IC-701

is

displayed

on

7

segment

LEDs.

Since

the

1MHz

and

1KHz

decimal

points

are

displayed,

the

frequency

can

easily

be

read.

The

fre-

quencies

indicated

are

the

carrier

frequencies

of

each

mode

in

USB,

LSB

and

CW.

In

the

RTTY

mode,

the

space

frequency

is

displayed.

Since

the

local

oscillation

frequency

is

shifted

in

accordance

with

modes,

no

tuning

will

be

required

if

you

change

modes.

Remember,

if

you

turn

the

RIT

control

ON

to

change

the

receive

frequency

and

rotate

the

RIT

control

knob,

the

frequency

displayed

will

not

change.

25.

TRANSMIT

INDICATOR

LED

When

your

set

is

in

the

transmit

mode,

this

LED

is

lit.

26.

DIAL

TUNING

SPEED

INDICATOR

LED

illuminates

when

the

TUNING

SPEED

BUTTON

is

pressed

to

set

the

dial

to

fast

tuning.

27.

DIAL

LOCK

INDICATOR

LED

illuminates

when

the

DIAL

LOCK

BUTTON

is

pressed

to

lock

the

dial.

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